391 lines
9.7 KiB
Go
391 lines
9.7 KiB
Go
|
// Package jwriter contains a JSON writer.
|
||
|
|
package jwriter
|
||
|
|
|
||
|
|
import (
|
||
|
|
"io"
|
||
|
|
"strconv"
|
||
|
|
"unicode/utf8"
|
||
|
|
|
||
|
|
"github.com/mailru/easyjson/buffer"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Flags describe various encoding options. The behavior may be actually implemented in the encoder, but
|
||
|
|
// Flags field in Writer is used to set and pass them around.
|
||
|
|
type Flags int
|
||
|
|
|
||
|
|
const (
|
||
|
|
NilMapAsEmpty Flags = 1 << iota // Encode nil map as '{}' rather than 'null'.
|
||
|
|
NilSliceAsEmpty // Encode nil slice as '[]' rather than 'null'.
|
||
|
|
)
|
||
|
|
|
||
|
|
// Writer is a JSON writer.
|
||
|
|
type Writer struct {
|
||
|
|
Flags Flags
|
||
|
|
|
||
|
|
Error error
|
||
|
|
Buffer buffer.Buffer
|
||
|
|
NoEscapeHTML bool
|
||
|
|
}
|
||
|
|
|
||
|
|
// Size returns the size of the data that was written out.
|
||
|
|
func (w *Writer) Size() int {
|
||
|
|
return w.Buffer.Size()
|
||
|
|
}
|
||
|
|
|
||
|
|
// DumpTo outputs the data to given io.Writer, resetting the buffer.
|
||
|
|
func (w *Writer) DumpTo(out io.Writer) (written int, err error) {
|
||
|
|
return w.Buffer.DumpTo(out)
|
||
|
|
}
|
||
|
|
|
||
|
|
// BuildBytes returns writer data as a single byte slice. You can optionally provide one byte slice
|
||
|
|
// as argument that it will try to reuse.
|
||
|
|
func (w *Writer) BuildBytes(reuse ...[]byte) ([]byte, error) {
|
||
|
|
if w.Error != nil {
|
||
|
|
return nil, w.Error
|
||
|
|
}
|
||
|
|
|
||
|
|
return w.Buffer.BuildBytes(reuse...), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ReadCloser returns an io.ReadCloser that can be used to read the data.
|
||
|
|
// ReadCloser also resets the buffer.
|
||
|
|
func (w *Writer) ReadCloser() (io.ReadCloser, error) {
|
||
|
|
if w.Error != nil {
|
||
|
|
return nil, w.Error
|
||
|
|
}
|
||
|
|
|
||
|
|
return w.Buffer.ReadCloser(), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// RawByte appends raw binary data to the buffer.
|
||
|
|
func (w *Writer) RawByte(c byte) {
|
||
|
|
w.Buffer.AppendByte(c)
|
||
|
|
}
|
||
|
|
|
||
|
|
// RawByte appends raw binary data to the buffer.
|
||
|
|
func (w *Writer) RawString(s string) {
|
||
|
|
w.Buffer.AppendString(s)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Raw appends raw binary data to the buffer or sets the error if it is given. Useful for
|
||
|
|
// calling with results of MarshalJSON-like functions.
|
||
|
|
func (w *Writer) Raw(data []byte, err error) {
|
||
|
|
switch {
|
||
|
|
case w.Error != nil:
|
||
|
|
return
|
||
|
|
case err != nil:
|
||
|
|
w.Error = err
|
||
|
|
case len(data) > 0:
|
||
|
|
w.Buffer.AppendBytes(data)
|
||
|
|
default:
|
||
|
|
w.RawString("null")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// RawText encloses raw binary data in quotes and appends in to the buffer.
|
||
|
|
// Useful for calling with results of MarshalText-like functions.
|
||
|
|
func (w *Writer) RawText(data []byte, err error) {
|
||
|
|
switch {
|
||
|
|
case w.Error != nil:
|
||
|
|
return
|
||
|
|
case err != nil:
|
||
|
|
w.Error = err
|
||
|
|
case len(data) > 0:
|
||
|
|
w.String(string(data))
|
||
|
|
default:
|
||
|
|
w.RawString("null")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Base64Bytes appends data to the buffer after base64 encoding it
|
||
|
|
func (w *Writer) Base64Bytes(data []byte) {
|
||
|
|
if data == nil {
|
||
|
|
w.Buffer.AppendString("null")
|
||
|
|
return
|
||
|
|
}
|
||
|
|
w.Buffer.AppendByte('"')
|
||
|
|
w.base64(data)
|
||
|
|
w.Buffer.AppendByte('"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint8(n uint8) {
|
||
|
|
w.Buffer.EnsureSpace(3)
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint16(n uint16) {
|
||
|
|
w.Buffer.EnsureSpace(5)
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint32(n uint32) {
|
||
|
|
w.Buffer.EnsureSpace(10)
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint(n uint) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint64(n uint64) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, n, 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int8(n int8) {
|
||
|
|
w.Buffer.EnsureSpace(4)
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int16(n int16) {
|
||
|
|
w.Buffer.EnsureSpace(6)
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int32(n int32) {
|
||
|
|
w.Buffer.EnsureSpace(11)
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int(n int) {
|
||
|
|
w.Buffer.EnsureSpace(21)
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int64(n int64) {
|
||
|
|
w.Buffer.EnsureSpace(21)
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, n, 10)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint8Str(n uint8) {
|
||
|
|
w.Buffer.EnsureSpace(3)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint16Str(n uint16) {
|
||
|
|
w.Buffer.EnsureSpace(5)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint32Str(n uint32) {
|
||
|
|
w.Buffer.EnsureSpace(10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) UintStr(n uint) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Uint64Str(n uint64) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, n, 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) UintptrStr(n uintptr) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int8Str(n int8) {
|
||
|
|
w.Buffer.EnsureSpace(4)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int16Str(n int16) {
|
||
|
|
w.Buffer.EnsureSpace(6)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int32Str(n int32) {
|
||
|
|
w.Buffer.EnsureSpace(11)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) IntStr(n int) {
|
||
|
|
w.Buffer.EnsureSpace(21)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Int64Str(n int64) {
|
||
|
|
w.Buffer.EnsureSpace(21)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, n, 10)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Float32(n float32) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 32)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Float32Str(n float32) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 32)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Float64(n float64) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, n, 'g', -1, 64)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Float64Str(n float64) {
|
||
|
|
w.Buffer.EnsureSpace(20)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 64)
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, '"')
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) Bool(v bool) {
|
||
|
|
w.Buffer.EnsureSpace(5)
|
||
|
|
if v {
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, "true"...)
|
||
|
|
} else {
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, "false"...)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const chars = "0123456789abcdef"
|
||
|
|
|
||
|
|
func isNotEscapedSingleChar(c byte, escapeHTML bool) bool {
|
||
|
|
// Note: might make sense to use a table if there are more chars to escape. With 4 chars
|
||
|
|
// it benchmarks the same.
|
||
|
|
if escapeHTML {
|
||
|
|
return c != '<' && c != '>' && c != '&' && c != '\\' && c != '"' && c >= 0x20 && c < utf8.RuneSelf
|
||
|
|
} else {
|
||
|
|
return c != '\\' && c != '"' && c >= 0x20 && c < utf8.RuneSelf
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *Writer) String(s string) {
|
||
|
|
w.Buffer.AppendByte('"')
|
||
|
|
|
||
|
|
// Portions of the string that contain no escapes are appended as
|
||
|
|
// byte slices.
|
||
|
|
|
||
|
|
p := 0 // last non-escape symbol
|
||
|
|
|
||
|
|
for i := 0; i < len(s); {
|
||
|
|
c := s[i]
|
||
|
|
|
||
|
|
if isNotEscapedSingleChar(c, !w.NoEscapeHTML) {
|
||
|
|
// single-width character, no escaping is required
|
||
|
|
i++
|
||
|
|
continue
|
||
|
|
} else if c < utf8.RuneSelf {
|
||
|
|
// single-with character, need to escape
|
||
|
|
w.Buffer.AppendString(s[p:i])
|
||
|
|
switch c {
|
||
|
|
case '\t':
|
||
|
|
w.Buffer.AppendString(`\t`)
|
||
|
|
case '\r':
|
||
|
|
w.Buffer.AppendString(`\r`)
|
||
|
|
case '\n':
|
||
|
|
w.Buffer.AppendString(`\n`)
|
||
|
|
case '\\':
|
||
|
|
w.Buffer.AppendString(`\\`)
|
||
|
|
case '"':
|
||
|
|
w.Buffer.AppendString(`\"`)
|
||
|
|
default:
|
||
|
|
w.Buffer.AppendString(`\u00`)
|
||
|
|
w.Buffer.AppendByte(chars[c>>4])
|
||
|
|
w.Buffer.AppendByte(chars[c&0xf])
|
||
|
|
}
|
||
|
|
|
||
|
|
i++
|
||
|
|
p = i
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
// broken utf
|
||
|
|
runeValue, runeWidth := utf8.DecodeRuneInString(s[i:])
|
||
|
|
if runeValue == utf8.RuneError && runeWidth == 1 {
|
||
|
|
w.Buffer.AppendString(s[p:i])
|
||
|
|
w.Buffer.AppendString(`\ufffd`)
|
||
|
|
i++
|
||
|
|
p = i
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
// jsonp stuff - tab separator and line separator
|
||
|
|
if runeValue == '\u2028' || runeValue == '\u2029' {
|
||
|
|
w.Buffer.AppendString(s[p:i])
|
||
|
|
w.Buffer.AppendString(`\u202`)
|
||
|
|
w.Buffer.AppendByte(chars[runeValue&0xf])
|
||
|
|
i += runeWidth
|
||
|
|
p = i
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
i += runeWidth
|
||
|
|
}
|
||
|
|
w.Buffer.AppendString(s[p:])
|
||
|
|
w.Buffer.AppendByte('"')
|
||
|
|
}
|
||
|
|
|
||
|
|
const encode = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
|
||
|
|
const padChar = '='
|
||
|
|
|
||
|
|
func (w *Writer) base64(in []byte) {
|
||
|
|
|
||
|
|
if len(in) == 0 {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
w.Buffer.EnsureSpace(((len(in)-1)/3 + 1) * 4)
|
||
|
|
|
||
|
|
si := 0
|
||
|
|
n := (len(in) / 3) * 3
|
||
|
|
|
||
|
|
for si < n {
|
||
|
|
// Convert 3x 8bit source bytes into 4 bytes
|
||
|
|
val := uint(in[si+0])<<16 | uint(in[si+1])<<8 | uint(in[si+2])
|
||
|
|
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, encode[val>>18&0x3F], encode[val>>12&0x3F], encode[val>>6&0x3F], encode[val&0x3F])
|
||
|
|
|
||
|
|
si += 3
|
||
|
|
}
|
||
|
|
|
||
|
|
remain := len(in) - si
|
||
|
|
if remain == 0 {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// Add the remaining small block
|
||
|
|
val := uint(in[si+0]) << 16
|
||
|
|
if remain == 2 {
|
||
|
|
val |= uint(in[si+1]) << 8
|
||
|
|
}
|
||
|
|
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, encode[val>>18&0x3F], encode[val>>12&0x3F])
|
||
|
|
|
||
|
|
switch remain {
|
||
|
|
case 2:
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, encode[val>>6&0x3F], byte(padChar))
|
||
|
|
case 1:
|
||
|
|
w.Buffer.Buf = append(w.Buffer.Buf, byte(padChar), byte(padChar))
|
||
|
|
}
|
||
|
|
}
|